UOP XCeed™ Bioreactor for Selenium Removal

UOP XCeed Bioreactor Technology

With 100 years of experience removing

contaminants, UOP provides proven

wastewater treatment solutions that

improve operating efficiency.

UOP’s XCeedTM bioreactor technology incorporates simple design

principles and unique microbial growth support media for treating

the most challenging industrial wastewater streams. This advanced

technology provides robust and cost-effective operations while

minimizing sludge production and energy consumption.

BiologicalTreatment

Solid/LiquidSeparation

Adsorbent,RO,

Membranes

IndustrialWastewater Effluent

to Water Treatment

Pretreatment forOil, Grease

Bulk Treatment Post-treatmentPolish

Bulk Treatment

Discharge orReuse

Clarifer orDAF

Exhaust Gas Outlet

UOP XCeed Bioreactor Technology

Influent

Efffluent

Air Diffusers

Aeration (if needed)

Technology Overview

XCeed Bioreactor System >(Multi-chamber packed beds

with adjustable aeration)

Proprietary Mixed-Media(High surface area for microbes

to grow and mobilize, resulting in high rates of contaminant removal)

Bio-catalyst(Extended microbial life

minimizes sludge generation)

XCeed bioreactor technology key components

Features Benefits

• Rapid reduction of selenate and selenite • Increased microbial solids retention time• Low hydraulic retention time• Stable microbial population

• Meet low ppb level discharge requirements• Resistant to upstream process upsets• Consistent effluent quality• Minimal sludge production• Small footprint

High efficiency in a compact designXCeed utilizes a packed bed, semi-plug flow

design that provides long solids retention times

while minimizing hydraulic retention time. The

increased solids retention time results in a high

biomass to feed ratio that promotes biological

oxygen demand (BOD) removal while minimizing

sludge formation. High concentrations of

immobilized bacteria provide natural resistance

to, and fast recovery from, process upsets.

The high microbioal density and flexible process

configuration also allows for a small system

footprint.

Selenium removal Traditionally, selenate (SeO4

2-) and selenite

(SeO32-) are difficult to remove from industrial

wastewater using physical-chemical processes.

For example, iron precipitation does not meet

discharge requirements at low parts per billion

(ppb) levels and has high sludge volume.

However, selenate and selenite are readily

reduced to insoluble elemental selenium by

microbial reduction. Both can be reduced to

elemental selenium more rapidly when a diverse

bacterial flora is present in the bioreactor. If

other substrates such as dissolved oxygen

or nitrate are present, the bacteria will

preferentially grow on them because they

generate more energy. To remove selenium

biologically, oxygen and nitrate must be

removed to establish anoxic conditions.

The XCeed bioreactor system can be configured

with aerobic and anaerobic sections to treat

all forms of soluble selenium species. High

concentrations of immobilized biomass in the

XCeed system allow for a faster reaction and

smaller footprint.

Bacterial Cell

Organic Carbon

CO2

Decreasing Energy Yield

Energy for cell growth

H2O H2SN2 Se

O2 SO42-NO3

- SeO32-

SeO42-

SeO42- + Org. C bacteria SeO3

2- + Org. C bacteria SeO + CO2 + H2O

For more informationTo learn more, please contact your

UOP representative or visit us online

at www.uop.com.

UOP LLC, A Honeywell Company25 East Algonquin Road

Des Plaines, IL 60017-5017, U.S.A.

Tel: +1-847-391-2000

www.uop.com

UOP7405June 2016Printed in U.S.A.© 2016 UOP LLC. All rights reserved.

UOP XCeed bioreactor technology provides a cost-effective, high-performance industrial wastewater treatment solution

UOP capabilitiesUOP has extensive experience in delivering industrial wastewater treatment solutions by using the following project delivery approach.

InquiryEvaluate existing

facility and treatment goals

Conduct treatability

study

Optional pilot study

Develop cost

estimateDeliver turnkey modular system

Conduct system commissioning

and handover to site operator

Ongoing training

and support

UOP’s global presence provides regional sales and technical support.

Sales Offices Research and Development Manufacturing Engineering Centers